Pneumatic motor.



l PATENTED lMAY 7, 1'90'7. J. H. CHASE. PNEUMATIG MOTOR. APPLIOATION FILED JUNE 2v 1902 f h d 4 'J70/@mfr /7/ im? UNITED sTATEs PATENT 4oEEioE.

JOSEPH HERBERT CHASE, OF BUFFALO, NEW YORK, ASSIGNOR TO THE CHASE AND BAKER COMPANY, OF` BUFFALO, NEW YORK.

PNEUMATfIC MOTOR.

Patented May 7, 1907.

Application iiled June 27, 1902. Serial No. 113,547.

as simple and economical of manufacture as .is consistent with kgood practice, and as is possible without lessening 'the desired high efficiency of the motor. This laccomplish by dispensing, as muchas possible, with various parts and features heretofore considered necessary, and, in addition, I increase the general efficiency by reducing friction and providing less obstructed passages for the air currents employed in operating the motor. Like the motors heretofore employed, my

A improved motor involves aplurality of bellows, afcrank-shaft, and a valve-mechanism But, unlike the motors heretofore employed, each valve mechanism of my improved construction includes but a single smooth-face slide-valve inclosed within a box and adapted to control both the exhaust-port and the air-inlet port through which the air is alternately admitted andexhausted to and from the bellows. /Vith this arrangement, an essential feature of the invention consists in the provision of a suctionopening, whereby the exhaust acts constantly on the smooth fiat face of the valve,

and whereby the valve is, in this way, held to its seat by the same pressure which drives the motor. Also, with this `arrangement whereby a single smooth-faced slide-valve is amply sufficient for each bellows, the air l passes throughthe valve-chamber and around the valve before entering the bellows. Furthermore, with this `construction and mode of operation, the `ports are all on one side ofthe valve and all covered by the box or valve-casing. l thus rovide an improved and exceedingly simplified and highly efficient mechanism for controlling the admis- In a motor of this character, it is sion and exhaust of air to and from each bellows.

One of the distinguishing features of my invention, .and an important `one, consists in the employment of a single smooth-faced slide-valve for controlling both the inlet and exhaust ports, and .in admitting the air to the bellows through the valve box.

Still another feature of importance consists -in the employment of a suction port, which is preferably of larger area -than the inlet port, and which acts constantly on the smooth flat face of the slide-valve, so as to prevent the valve from becoming unseated when it moves in a direction to cover the inlet port and uncover the exhaust port.

These and 'other features, as will hereinafter more fully appear, go to make up my improved motor.

My invention is illustrated inV the accompanyingdrawing forming a part of this speciiication, in which: Y

Figure l is an (elevation of a motor embodying myinvention, showing a sectional view of portions thereof, as indicated by the cross hatching and also showing certain internal ortions of said motor, indicated by dotted ines. Fig. 2 is a side elevation of such motor showing a vertical sectional view of a portion thereof, indicated by the cross hatching. Fig. 3 is a plan view of the chambered blockf forming part of my motor.

Bis a collapsible bellows, of which three are shown in Fig. l, but that exact number is not essential to the operation of my motor, although the most convenient in practice. They are all alike in construction and a side elevation of one of them is shown in Fig. 2, where b represents a side of the bellows B held immovably in position by being attached to the main frame A. The movable bellows side b2 is hinged or jointed to b at t and the bellows B is completed 'by connecting b and b2 with'collapsible material b4, such as leather or india rubber. The crank c in the crank shaft s is connected with the movable bellows side b2 by -means of the link p. The cranks are arranged at different intervals or angles for the different bellows, the best arrangement where three bellows are employed being -a crank for every 120 degrees of angular distance. Asingle air passage, Qc, connects .the

interior of B with the chamber t, and t in turn communicates through the port 0 with TOO the exhaust passage e, and through the port 03 with the air passage a communicating directly with the outer atmosphere g the exchamber v and alternately opening and closing the ports 0 and 03; the movement of the block 7c being communicated to the valve m by means of the pin d which plays back and -forth in a narrow slot h inthe roof of the chambered block The bottom of the slide k presents a fiat surface covering the slot h and prevents the ingress or egress of air to or from the chamber 'u through the slot. The suction opening o2 opening into the exhaust passage e is never uncovered by the valve m, but through it a constant suction on the bottom of the valve m is exerted, thus holding the valve m securely in place and preventing any leakage of air through the ports 0 and o3 when they are covered by the valve m. I prefer to make the suction opening o2 slightly larger in area of cross section than either o or o3, thus assuring a close fit of the valve m upon its seat without being compelled to resort to the use of a spring or other similar means.

The movements of the various moving parts of my motor are so arranged and adj usted that during the exhaustion ofair from the bellows B through the passage x, the movable bellows side b2 moves the link p which in turn imparts a rotary motion to the crankshaft s through the crank c, the valve m, during this interval, being so placed by the link p2 that the exhaust port 0 is open and the air port o3 is closed 3 on the other hand, during the interval of refilling with air of the bellows B, the rotation of the crank shaft s is induced by the exhaustion of air from one or more of the other bellows B attached to the motor, and the link p acted upon by the crank c forces back the bellows side b2 and air passes into the bellows B through the opening the valve m being placed during this interval of refilling in such position by the link p2 that the air port o3 is open and the exhaust port o is closed. It will be seen that a constant uniform rotation of the vcrank shaft is thus obtained and that from the revolving crankshaft the power may be taken and applied bycomplished by admitting the air to the bellows through the chamber of the valve box. Furthermore, with this arrangement, the

provision of the constant suction port, which is located between the air inlet and exhaust ports, and which acts constantly on the valve, prevents the latter from becoming unseated when the valve moves in a direction to close the air inlet port and uncover the exhaust port. rIhus the admission and exhaust is all accomplished through the medium of a single slide valve having a smooth fiat face.

What I claim as my invention is:

l. In a pneumatic motor, the combination of a bellows having a single opening through which the air passes in and out, the body of the motor having an exhaust passage, a tight stationary chambered block covering the bellows opening and the exhaust passage, the

chamber of said block being in constant coinmunication with said single opening and thereby affording a passage for the admission and exhaust of air to and from the bellows, an exhaust port for connecting the said chamber with the exhaust passage,- an air passage, an air-inlet port for connecting the said chamber with the air passage, a single slide-valve inclosed within said chambered block, adapted to open and close the air-inlet and exhaust ports alternately, and means whereby the bellows operates said valve, said slide-valve having a flat unbroken face or working surface held in sliding contact with the 'at ported valve-seat or surface upon which it works, the said slide-valve face directly controlling both theadmission and exhaust of air to and from the interior of the valve-chamber, and thereby controlling the admission and exhaust of air to and from the bellows.

'2. In a pneumatic motor, a bellows having a single opening communicating alternately with an exhaust passage and an air-inlet passage by means of two ports opened alternately and both controlled by a single slidevalve, said slide-valve having a flat unbroken face or working surface held in sliding contact withlthe fiat ported valve-seat or surface upon which it works, the said slide-valve face a ternately coveringy and uncovering said ports and thereby directly controlling both the admission and exhaust of air to and from the interior of the valve-chamber, and thereby controlling the admission and exhaust of air to and from the bellows.

3. In a pneumatic' motor, the combination of a slide-valve, a suction opening always IOO rio

closed by the valve and holding the latter to ISO the admission and exhaust ofvair to and from the interior of the valve-chamber, and thereby controlling the admission and/exhaust of air to .and from the bellows.

4l. In a pneumatic motor, -the combination of a bellows, admission and exhaust ports, a tight-chambered block, a slide valve moving-therein:and'connected withan outer slide by .means 'of a pin passing througha slot in the chambered block, .rt-he said slide serving to at all times keep the said slot closed, the interior of said block IaHording a passage for the .ad-mission kof air to vand ,from 1the bellows by wayiofadmission and exhaust `portswhich are .alternately covered and uncovered and thereby directly controlled by the face of said valve, said slide-valve having a fiat unbroken face or working'su-rface heldin sliding contact with the .fiat ported valve-seat or surface upon which it works, the said slidevalve face directly controlling both the admission and exhaust of air to and from the interior of the valve-chamber, and-thereby controlling the admission and exhaust of air to and from the bellows.

5. In a pneumatic motor, the combination of a bellows,l a tight stationary chambered blockprovided with and inclosing a slidevalve, the interior of said block affording a passage for the admission and exhaust of air. to and from the bellows, the said valve acting to open and close air-inlet and exhaust ports alternately, the saidchambered block having its interior in constant communication with a single opening leading to the bellows, said slide-valve having a flat unbroken face or working surface held in sliding contact with the flat ported valve-seat or surface upon which it works, the said slide-valve face directly controlling both the admission and exhaust of air to and from the interior of the valve-chamber, and thereby controlling the admission and exhaust of air to and from the bellows.

6. A pneumatic motor comprising the frame or body A, the exhaust passage e, and the air-inlet passage a, the tight chambered block f attached to the said frame, the interior of said block affording a passage for the,

admission of air to the bellows, the slidef valve m working within the chamber of said block, the outer slide k and the pin d, the airinlet port o3 and the exhaust port 0, the bellows passage the suction opening o2 located between the air-inlet and exhaust ports and always closed by the valve, the collapsible bellows B having a movable portion b2, the crank-shaft s, thecrank c, and the links p and p2, said slide-valve having a fiat unbroken the admission and exhaust'of air to and from the bellows.

'7. A pneumatic motor comprising the stationary chambered block f providing the chamber v, the interior chamber ,of said 'block vaffording a passage for the admission .and exhaust of air to and from the bellows, the Abellows opening x, always open or uncovered, the exhaust passage e, the exhaust port o, the air-inlet passage a, the air-inlet port 03, v.the valve m, the suction opening 02 located between the air-inlet and exhaust ports and always closed by the valve, the slide le, and the pin d working in the slot h, said valve having a flat unbroken face or working surface held in sliding contact with the flat ported valve-seat or surface upon which it works, the said slide-valve face directly controlling both the yadmission and Vexhaust of air to and from the interior of the valvechamber, and thereby controlling the admission and exhaust of air to and from the bellows.

8. In a pneumatic motor, the combination of a single valve controlling air-inlet and exhaust ports communicating alternately with a single bellows opening, a suction opening located intermediate of said ports and acting to hold said valve to its seat, said slide-valve having a at unbroken face or working surface held in sliding contact with the flat ported valve-seat or surface upon which it works, the said slide-valve face directly controlling both the admission and exhaust of air to and from the interior of the valvechamber, and thereby controlling the admission and exhaust of air to and from the bellows.

9. A pneumatic motor comprising a valve m controlling the air-inlet port and the exhaust port and always covering the intermediate suction opening o2 by which it is held to its seat, said slide-valve having a flat unbroken face or working surface held in sliding contact with the flat ported valve-seat or surface upon which it works, the said slidevalve face directly controlling both the admission and exhaust of air to and from the interior of the valve-chamber, and thereby controlling the admission and exhaust of air to and from the bellows.

l0. A pneumatic motor comprising a motor body having a plurality of collapsible bellows on one side thereof, tight stationary chambered .inclosures on the opposite side thereof, the interior of each inclosure affording a passage for the admission of air to the bellows, a combined admission and exhaust opening leading from. each bellows to and communicating constantly with the chamber of the associated inclosure, and a single slide-valve in each chamber, each valve acting to alternately make vand break connection between said bellows opening and the open air, and between said bellows opening and roo IIO

an air-exhausting apparatus, said slide-Valve having a fiat unbroken face or working surface held in sliding contact with the i'lat ported Valve-seat or surface upon which it works, the said slide-valve face directly controlling both the admission and exhaust of air to and from the interior of the Valyechamber, and thereby controlling the admission and exhaust of air to and fromthe bellows.

11. In a motor, a bellows, a bellows-opening, a Valve-chamber, in. constant and permanent communication with said opening, admission and exhaust ports leading to and away from said chamber by which air is admitted to and exhausted from the bellows by way of said opening, and a'valve in the chamber, saidvalve having a flat smooth unbroken face directly controlling both the admission port and exhaust port, and thereby controlling the admission and exhaust of air to and from the said Valve-chamber.

12. In a pneumatic motor, the combination of the stationary chambered inclosure with the single flat smooth-faced slide-Valve, there being air-inlet and exhaust ports, and there being also a suction opening intermediate of said openings, said ports being opened and closed alternately by the valve, but the said suction opening being always coveredby the smooth fiat face of the Valve,

In witness whereof, I hereunto subscribe my name this third day of June, 1902.

JOSEPH HERBERT CHASE. Y

Witnesses:

MARY E. SULLIVAN, ERNEST L. FRISBEE. 

